So, had brief encounter with sex worker. I am a male and she a female, just for clarity and accuracy of response though I'm confident that this is irrelevant. In any case, I received oral sex lasting only a couple minutes then shortly after completed with handjob. Anyway, that night I had extreme regrets as this not something I regularly do, only once before. So in my anxious state, I thought it best to be proactive and see if I could prevent any full infection from developing.